Margaret “Meg” Ninos, prominent junior rider in the 1970s, was found murdered at her home in Medfield, Mass., Feb. 6. She was 47.

Ms. Ninos rode out of her family’s Olympia Farms in Cazenovia, N.Y., growing up and was one of the most successful junior riders on the Syracuse Professional Horsemen’s Circuit. Some of her famous mounts included the large pony hunter Top Quality, Santee Sal, Laura’s Theme and So Many Ways, whom she rode to ribbons in the junior hunters at the National Horse Show (N.Y.) in 1978.

She was a graduate of Mount Holyoke College (Mass.) and began her career as a labor and delivery nurse in 1988. She worked out of Beth Israel Deaconess Medical Center in Boston, Mass.

Ms. Ninos’ survivors include her 7-year-old daughter Maggie; her mother, Margaret McIntosh Ninos; and her brothers, John Ninos and Steve Ninos. She was preceded in death by her father, George Ninos.

According to Norfolk District Attorney William Keating, the investigation into her death was closed after the apparent suicide of her ex-husband, Andrew Boisvert on Feb. 11.

Memorial donations may be made to The M. Ninos Trust Fund, c/o Benjamin Franklin Bank, 76 North Street, Medfield MA 02052 or Friends of Maggie Ninos, c/o Needham Bank, 520 Main Street, Medfield MA 02052.